121785065 has 8 divisors (see below), whose sum is σ = 151181640. Its totient is φ = 94068352.

The previous prime is 121785061. The next prime is 121785091. The reversal of 121785065 is 560587121.

It can be written as a sum of positive squares in 4 ways, for example, as 49942489 + 71842576 = 7067^2 + 8476^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121785065 - 2² = 121785061 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121785061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 419804 + ... + 420093.

It is an arithmetic number, because the mean of its divisors is an integer number (18897705).

Almost surely, 2^121785065 is an apocalyptic number.

It is an amenable number.

121785065 is a deficient number, since it is larger than the sum of its proper divisors (29396575).

121785065 is an equidigital number, since it uses as much as digits as its factorization.

121785065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 839931.

The product of its (nonzero) digits is 16800, while the sum is 35.

The square root of 121785065 is about 11035.6270777877. The cubic root of 121785065 is about 495.6761361876.

The spelling of 121785065 in words is "one hundred twenty-one million, seven hundred eighty-five thousand, sixty-five".